两广云开地区前震旦纪地层

云开地区前震旦纪地层由青白口纪－蓟县纪的云开群和长城纪的高州岩群组成，其中高州岩群新建黄岭岩组、莞塘组和新安组３个岩石地层单位。区域上，高州岩群与桂东南的四堡群、海南的抱板群相当；云开群的沙湾坪组与丹洲群和石碌群相当；而处于裂谷盆地中心的云开地区在蓟县纪沉积了罗罅组、丰垌口组及兰坑组

PRE SINIAN STRATA IN THE YUNKAI AREA IN GUANGDONG AND GUANGXI PROVINCE

Pre Sinian strata in the Yunkai area are composed of the Yunkai Group of the Qingbaikou’ an Period Jixianian Period and the Gaozhou Group Complex of the Changchengian Period.Three new lithostratigraphic units,the Huangling Formation Complex,Guantang Formation and Xinan Formation,have been established.Regionally,the Gaozhou Group Complex is equivalent to the Sibao Group in southeastern Guangxi and the Baoban Group in Hainan,and the Shawanping Formation of the Yunkai Group to the Danzhou and Shilu Groups.The Luoxia,Fengdongkou and Lankeng Formations were deposited in the Jixianian Period in the Yunkai area in the center of the rift basin.